F1 tyres: Mercedes insist safety is paramount – video

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Mercedes sporting director Toto Wolff says driver safety is top priority as Formula One attempts to deal with a tyre problem which blighted the British Grand Prix. Mercedes caused controversy earlier in the season when they conducted a tyre test with Pirelli in Spain. Since then Formula One owner Bernie Ecclestone has allowed Pirelli to conduct two three-hour tests to try and solve the problem